Antigen-Specific Activated T Cell Detection via Flow Cytometry
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Solution Overview
Problem
Current methods fail to selectively detect antigen-specific activated T cells among cell complexes formed between T cells and antigen-presenting cells, as immune synapse formation does not necessarily activate T cells, especially in cases of autoantigens or cancer antigens where immune tolerance occurs.
Innovation Solution
A method involving the use of flow cytometry to differentiate between antigen-specific activated T cells and background particles by measuring particle size and T cell activation markers in samples with and without an antigen reagent, allowing for the detection of activated T cell complexes based on distinct optical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If immune synapse formation is used as an indicator of T cell activation, then the detection of T cell activation can be simplified, but the accuracy of detection deteriorates because immune synapse formation does not necessarily activate the T cell
Solution Approach 1:
The invention divides the detection process into separate components: detecting immune synapse formation (cell complex formation) and detecting T cell activation (activation marker expression) as independent measurements. This segmentation allows the system to distinguish between cells that form synapses and cells that are actually activated, resolving the contradiction between simple detection and accurate detection.
Solution Approach 2:
The invention introduces an intermediary measurement approach by using flow cytometry to detect activation markers as an intermediate indicator between the physical synapse formation and actual T cell activation. This intermediary measurement layer enables accurate detection without requiring direct observation of activation mechanisms.
2Measurement precision
If flow cytometry is used to detect T cell activation markers, then the accuracy of activated T cell detection is improved, but the device complexity and measurement process increase
Solution Approach 1:
The invention makes the flow cytometer perform multiple functions: it detects both the physical characteristics of cell complexes (for synapse formation detection) and the expression levels of activation markers. This multi-functionality improves detection accuracy while avoiding the need for separate detection systems, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The invention changes the detection parameters by measuring both physical parameters (cell complex formation, particle size) and biochemical parameters (activation marker expression levels). This parameter expansion allows accurate differentiation between synapse-forming and activated cells using a single flow cytometry system.
3Measurement precision
If the measurement sample includes antigen reagent, then the detection of antigen-specific activated T cells is enabled, but the background noise from non-specific binding increases
Solution Approach 1:
The invention extracts and removes the harmful background noise by measuring a control sample without the antigen reagent. This control measurement allows the system to identify and subtract non-specific binding signals, thereby isolating the true antigen-specific T cell activation signal from the background noise.
Solution Approach 2:
The invention uses the control measurement (sample without antigen reagent) as feedback to correct the measurement from the test sample. By comparing the test sample against the control sample, the system can compensate for non-specific binding and improve the accuracy of antigen-specific T cell detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables selective detection of antigen-specific activated T cells, providing insights into specific immune responses and immune tolerance states, enhancing diagnostic capabilities in immunological studies and clinical applications.
Implementation Method 1
measuring particle size and T cell activation markers in samples with and without an antigen reagent, allowing for the detection of activated T cell complexes based on distinct optical signals
Data Source
AI summary
Disclosed is a method for detecting an antigen-specific activated T cell comprising: acquiring first information on a particle size and second information on a T cell activation marker for a first measurement sample prepared by mixing in vitro a first specimen separated from a biological sample containing a T cell and an antigen-presenting cell and an antigen reagent containing a predetermined antigen, by measuring the first measurement sample with a flow cytometer; acquiring the first information and the second information for a second measurement sample prepared from a second specimen separated from the biological sample and not containing the antigen reagent, by measuring the second measurement sample with the flow cytometer; detecting a target particle in the first measurement sample based on the first information and the second information on the first measurement sample, and detecting a background particle in the second measurement sample based on the first information and the second information on the second measurement sample; and detecting a cell complex in which the T cell and the antigen-presenting cell adhere to each other in the first measurement sample, the cell complex including a T cell activated by the predetermined antigen, based on a detection result of the target particle and a detection result of the background particle.